After venipuncture (blood collection process from patient using a syringe) the peripheral blood is collected. A drop of blood on a microscope slide can be spread evenly using a cover slip so as to create an even smear (film). The spread has to be extremely thin at the very end, so as to create a single cell layer which will allow bloods cells to be viewed under the microscope.
After the spreading on the microscope slide, the cells on the slides can be stained using various techniques, such as the Giemsa stain.
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